The offsetExists() function of the ArrayObject class in PHP is used to whether a given offset or index is present in the ArrayObject or not. If it is present then the function returns a boolean True value otherwise it returns False.
Parameters: This function accepts a single parameter $index which is the index which is to be checked if it is present in the ArrayObject.
Return Value: This function returns a boolean value True or False based on whether the index is present in the ArrayObject or not.
Below programs illustrate the above function:
ArrayObject Object ( [storage:ArrayObject:private] => Array (  => geeks100  => geeks99  => geeks1  => geeks02 ) ) The key 1 is present! The key 20 is not present!
ArrayObject Object ( [storage:ArrayObject:private] => Array ( [Welcome] => 1 [to] => 2 [GfG] => 3 ) ) The key Welcome is present! The key GfG is present!